CAN CSA C50064-99:2016 pdf download.Wrought aluminium and aluminium alloy enclosures for gas-filled high-voltage switchgear and controlgear
2.2 Production
The production of the enclosures shall be in accordance with documented welding procedures which shall be carried out by well trained and supervised welding personnel.
Where International Standards (ISO or CEN) are not available National Standards may be used.
NOTE This standard will be revised as soon as possible when ISO or CEN standards covering the various aspects are available.
2.3 Quality assurance
It is the intention of this standard that the switchgear manufacturer shall be responsible for achieving and main-taining a consistent and adequate quality of product.
Sufficient examinations shall be made by the enclosure manufacturer to ensure that the materials, production and testing comply in all respects with the requirements of this standard and ISo 6213: 1983. Inspection by the user's inspectors shall not absolve the switchgear manufacturer from his responsibility to exercise such quality assurance procedures as to ensure that the requirements and the intent of this standard are satisfied.
NOTE Reference should be made to the ISO 9000 series of standards for quality assurance systems.
5.1 General
The rules for the design of enclosures of gas-insulated switchgear and controlgear prescribed in this clause are solely for the purpose of determining the dimensions and the minimum thickness to ensure safety of the enclosures against gross plastic deformation, incremental collapse and collapse through buckling with the materials given in clause 4.
The rules take into account that these enclosures are subjected to particular operating conditions (see clause 1) which distinguish them from conventional compressed air receivers and similar storage vessels.
The thicknesses determined by the various equations are minima and therefore, the specific nominal thickness shall be increased by the amount of any negative tolerance permitted by the material specification.
NOTE There are designs of enclosures which differ in geometry from those for which equations are given in 5.7 and 5.8. These designs are permitted provided the calculation is justified or prove tests are carried out as prescribed in 7.5.3.
5.2 Corrosion allowance
The enclosures are flled in service with a noncorrosive thoroughly dried gas, therefore, no internal corrosion allowance is necessary.
5.3 Design considerations
The geometry of an enclosure can be determined by electrical rather than mechanical considerations. This con-straint can result in an enclosure geometry which requires an unacceptable degree of calculation or which cannot be calculated at all.
In the case of such an enclosure or an enclosure for which calculations are not made, a proof test of the individual housing is necessary before the internal parts are added.When designing an enclosure, account shall be taken of the
following, if applicable.CAN CSA C50064-99 pdf download.